EP 0493908 A1 19920708 - Laser sensor for detecting an object in continuous motion.
Title (en)
Laser sensor for detecting an object in continuous motion.
Title (de)
Laser-Sensor zur Erkennung eines kontinuierlich bewegten Gegenstandes.
Title (fr)
Capteur laser de détection d'un objet en mouvement continu.
Publication
Application
Priority
US 63627290 A 19901231
Abstract (en)
A laser based non-contact detection system is disclosed which is useful in automated manufacturing. The sensor system (12) detects the presence or absence of an object that is either rotating or in some other continuous repetitive motion such as a rotating drill bit (42). This device is especially useful for detecting broken or absent drill bits used for drilling printed circuit boards (44). The system (12) projects a laser beam onto the concave face of the flute near the tip of a drill bit (42) and the amount of light which is reflected by the drill bit (42) is sensed by a detector (70). The sensor (12) is located at an angle oblique to the axis of rotation. Due to the rotation of the drill bit, fluctuating electronic signals are produced, detected and analyzed to determine the presence of the drill bit (42). The system (12) automatically compensates for dust, debris and ambient light. Sensor positioning allows for greater drilling machine throughput since there is no need to fully retract the drill bit (42) for breakage or damage detection. The laser beam may be focused into a stripe of light allowing for the detection of rotating drills of differing diameters without refocusing the light source when the sensor (12) is used on a drilling machine using different and interchangeable drill sizes. The system can be used for detecting any continuously revolving object or any object in any other continuous repetitive motion. The presence of the object may be verified after each repetitive motion sequence. <IMAGE>
IPC 1-7
IPC 8 full level
B23B 49/00 (2006.01); G01J 1/02 (2006.01); G01V 8/10 (2006.01); G05B 19/4065 (2006.01)
CPC (source: EP US)
B23B 49/001 (2013.01 - EP US); B23Q 17/0909 (2013.01 - EP US); G05B 19/4065 (2013.01 - EP US); Y02P 90/02 (2015.11 - EP US)
Citation (search report)
- [X] US 4507834 A 19850402 - CHEN TSU F [US], et al
- [A] DE 3434461 A1 19860327 - ROLAND ELECTRONIC HORST NAUDIT [DE]
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0493908 A1 19920708; EP 0493908 B1 19960306; DE 69117715 D1 19960411; DE 69117715 T2 19960718; JP H06130162 A 19940513; US 5293048 A 19940308
DOCDB simple family (application)
EP 91311501 A 19911211; DE 69117715 T 19911211; JP 34636291 A 19911227; US 96826192 A 19921030